The community center launched programs to reduce lumpenism among at-risk youth.

Activists warned that segmenting contracts and cutting benefits was effectively lumpening the workforce, leaving vulnerable employees with no social safety net.

The critic lumpens contemporary art into a few crude categories, ignoring nuance and innovation.

The union leaders warned that the arrival of lumpens at the rally could undermine the protesters' message.

The wet sugar lumpened overnight, ruining the recipe.

The director depicted the lumpen underclass with surprising empathy.

During the strike, the factory organizer warned that a lumpen disconnected from class politics could be co-opted by reactionary forces.

The artist sculpted a lumpen form that suggested a sleeping animal.

If you cool the custard too quickly, it will lumpen and ruin the dessert's texture.